#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>

int main()
{
  pid_t id=fork();
  if(id==0)//child
  {
    while(1)
    {
      printf("child... pid:%d ppid:%d \n ",getpid(),getppid());
      sleep(2);
    }
  }
  else//father 
  {
    while(1)
    {
      printf("father... pid:%d ppid:%d \n ",getpid(),getppid());
      sleep(1);
    }
  }
  system("pause");
  return 0;
}

